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1. Quantifying both ammonium and proline in wines and beer by using a PDMS composite for sensoring

Author:
Prieto-Blanco, María Carmen; Jornet-Martinez, Neus; Verdú-Andrés, Jorge; Molíns-Legua, Carmen; Campíns-Falcó, Pilar
Source:
Talanta 2019 v.198 pp. 371-376
ISSN:
0039-9140
Subject:
thymol,   etc   ; ammonium; beers; cost effectiveness; detection limit; nitroprusside; proline; wines;     Show all 8 Subjects
Abstract:
... Two of the reagents involved in the Berthelot's reaction, thymol and nitroprusside, were embedded in a PDMS composite in order to apply this assay to determine ammonium and proline, in wine and beers. Safety, portability, rapidity, cost-effectiveness and simplicity of the assay were improved. For the proline determination, a modified Berthelot's reaction, which included a ring cleavage of proline, ...
DOI:
10.1016/j.talanta.2019.02.001

2. Investigation of OH bond energy for chemically treated alfa fibers

Author:
Turki, Arwa; El Oudiani, Asma; Msahli, Slah; Sakli, Faouzi
Source:
Carbohydrate polymers 2018 v.186 pp. 226-235
ISSN:
0144-8617
Subject:
thymol,   etc   ; energy; hydrogen; hydrogen bonding; moieties;     Show all 5 Subjects
Abstract:
... This work aims to study the hydrogen bond energy and distance for different samples of alfa fibers treated with thymol. The treatment duration and thymol concentration were varied and seem to have a great influence on infrared band intensities and positions. The number of hydrogen bonds is related to the infrared band intensity, whereas their energy and distance depend on the infrared band positio ...
DOI:
10.1016/j.carbpol.2018.01.030

3. Methodology for the Absolute Configuration Determination of Epoxythymols Using the Constituents of Ageratina glabrata

Author:
Arreaga-González, Héctor M.; Pardo-Novoa, Julio C.; del Río, Rosa E.; Rodríguez-García, Gabriela; Torres-Valencia, J. Martín; Manríquez-Torres, J. Jesús; Cerda-García-Rojas, Carlos M.; Joseph-Nathan, Pedro; Gómez-Hurtado, Mario A.
Source:
Journal of natural products 2018 v.81 no.1 pp. 63-71
ISSN:
1520-6025
Subject:
thymol,   etc   ; Ageratina; circular dichroism spectroscopy; protocols; stereochemistry;     Show all 5 Subjects
Abstract:
... A methodology to determine the enantiomeric excess and the absolute configuration (AC) of natural epoxythymols was developed and tested using five constituents of Ageratina glabrata. The methodology is based on enantiomeric purity determination employing 1,1′-bi-2-naphthol (BINOL) as a chiral solvating agent combined with vibrational circular dichroism (VCD) measurements and calculations. The conf ...
DOI:
10.1021/acs.jnatprod.7b00637

4. Growth regulators affect the dry weight production, carvacrol and thymol content of Lippia gracilis Schauer

Author:
Santos Lazzarini, Luiz Eduardo; Vilela Bertolucci, Suzan Kelly; de Carvalho, Alexandre Alves; Santiago, Alexsandro Carvalho; Pacheco, Fernanda Ventorim; Ferreira Célio, Maria Mariana; Pereira Pinto, José Eduardo Brasil
Source:
Industrial crops and products 2019 v.129 pp. 35-44
ISSN:
0926-6690
Subject:
thymol,   etc   ; Lippia; benzyladenine; carvacrol; essential oils; gamma-terpinene; leaves; naphthaleneacetic acid; roots; shoots; volatile compounds;     Show all 11 Subjects
Abstract:
... The essential oil from Lippia gracilis Schauer (Verbenaceae) leaves are rich in thymol and carvacrol with antibactericidal and antinflammatory action. The aim of the present study was to evaluate the effect of growth regulators and their combinations on shoot proliferation, growth, and volatile fraction analysis of Lippia gracilis in vitro. In the first experiment, five different concentrations of ...
DOI:
10.1016/j.indcrop.2018.11.070

5. Thorough characterization and stability of HP‐β‐cyclodextrin thymol inclusion complexes prepared by microwave technology: A required approach to a successful application in food industry

Author:
Rodríguez‐López, María Isabel; Mercader‐Ros, María Teresa; López‐Miranda, Santiago; Pellicer, José A; Pérez‐Garrido, Alfonso; Pérez‐Sánchez, Horacio; Núñez‐Delicado, Estrella; Gabaldón, José A
Source:
Journal of the science of food and agriculture 2019 v.99 no.3 pp. 1322-1333
ISSN:
0022-5142
Subject:
thymol,   etc   ; aqueous solutions; cyclodextrins; encapsulation; food industry; industrial applications; ingredients; pH; solubilization;     Show all 9 Subjects
Abstract:
... BACKGROUND: The aims of the present study were to obtain a stable dry powder formulation of cyclodextrins (CDs) encapsulating thymol, for successful use as an ingredient on an industrial scale, and to characterize the thymol‐CDs complexes using different techniques. RESULTS: Thymol was successfully solubilized in aqueous solutions and the Kc value increased with the pH of the media until the pH wa ...
DOI:
10.1002/jsfa.9307

6. Thymol derivatives from the roots of Eupatorium chinense and their cytotoxic activities

Author:
Zhang, Qing-Qing; Sun, Zhi-Ying; Feng, Xue-Yun; Chen, Run-Jie; Deng, Wen; Tang, Yong-Li; Guo, Zhi-Yong; Liu, Cheng-Xiong; Chen, Jian-Feng; Zou, Kun
Source:
Phytochemistry letters 2019 v.29 pp. 165-168
ISSN:
1874-3900
Subject:
thymol,   etc   ; Eupatorium; cell lines; cytotoxicity; inhibitory concentration 50; neoplasm cells; nuclear magnetic resonance spectroscopy; roots;     Show all 8 Subjects
Abstract:
... Two new thymol derivatives (compounds 1–2) were isolated from the roots of Eupatorium chinense. Their structures were elucidated by analysis of MS data and extensive 1D and 2D NMR spectroscopy (1H-1H COSY, HMBC, HSQC and NOESY). The absolute configuration of compound 1 was assigned based on a comparison of calculated and experimental ECD. Compounds 1–2 were tested in vitro for their cytotoxic acti ...
DOI:
10.1016/j.phytol.2018.12.008

7. A Search for Natural Hydrophobic Deep Eutectic Solvents Based on Natural Components

Author:
van Osch, Dannie J. G. P.; Dietz, Carin H. J. T.; van Spronsen, Jaap; Kroon, Maaike C.; Gallucci, Fausto; van Sint Annaland, Martin; Tuinier, Remco
Source:
ACS sustainable chemistry & engineering 2019 v.7 no.3 pp. 2933-2942
ISSN:
2168-0485
Subject:
thymol,   etc   ; chemical engineering; coumarin; hydrophobicity; menthol; mixing; pH; riboflavin; solvents; viscosity;     Show all 10 Subjects
Abstract:
... Deep eutectic solvents (DESs) based on terpenes are identified and characterized. 507 combinations of solid components are tested, which results in the identification of 17 new hydrophobic DESs. Four criteria are introduced to assess the sustainability of these hydrophobic DESs from a chemical engineering point of view. These criteria include a viscosity smaller than 100 mPa·s, a density differenc ...
DOI:
10.1021/acssuschemeng.8b03520

8. Long-term dynamics of honey bee colonies following exposure to chemical stress

Author:
Colin, Théotime; Meikle, William G.; Paten, Amy M.; Barron, Andrew B.
Source:
The Science of the total environment 2019 v.677 pp. 660-670
ISSN:
0048-9697
Subject:
thymol,   etc   ; acaricides; agrochemicals; foraging; honey; honey bee colonies; honey bees; imidacloprid; pesticide residues; risk; temperature; viability; Arizona; Australia;     Show all 14 Subjects
Abstract:
... Pesticide residues have been linked to reduced bee health and increased honey bee colony failure. Most research to date has investigated the role of pesticides on individual honey bees, and it is still unclear how trace levels of pesticides change colony viability and productivity over seasonal time scales. To address this question we exposed standard bee colonies to chemical stressors known to ha ...
DOI:
10.1016/j.scitotenv.2019.04.402

9. Antioxidant efficacy of thymol and carvacrol in microencapsulated walnut oil triacylglycerols

Author:
Gursul, Sevilay; Karabulut, Ihsan; Durmaz, Gokhan
Source:
Food chemistry 2019 v.278 pp. 805-810
ISSN:
0308-8146
Subject:
thymol,   etc   ; antioxidant activity; antioxidants; carvacrol; dose response; emulsions; freeze drying; microencapsulation; ovens; oxidative stability; sodium; triacylglycerols; walnut oil;     Show all 13 Subjects
Abstract:
... Antioxidant efficiency of thymol and carvacrol in walnut oil triacylglycerols (WO-TAGs) was investigated. WO-TAGs alone or fortified with thymol/carvacrol were emulsified with sodium caseinate-lactose mixture. Oxidative stability of freeze dried emulsions was assessed via Rancimat and accelerated oven tests. Bulk WO-TAGs with and without thymol/carvacrol were also tested for comparison. Higher ind ...
DOI:
10.1016/j.foodchem.2018.11.134

10. Thymol derivatives from the roots of Xerolekia speciosissima an endemic species of the pre-Alpine area

Author:
Kłeczek, Natalia; Malarz, Janusz; Kosecka-Strojek, Maja; Musielak, Bogdan; Stojakowska, Anna
Source:
Phytochemistry letters 2019
ISSN:
1874-3900
Subject:
thymol,   etc   ; Asteraceae; Staphylococcus aureus; benzoquinones; chloroform; disk diffusion antimicrobial test; indigenous species; novobiocin; nuclear magnetic resonance spectroscopy; roots; spectral analysis;     Show all 11 Subjects
Abstract:
... A chloroform extract from roots of Xerolekia speciosissima, except for commonly distributed phenolic compounds, i.e.: syringaldehyde and 2,6-dimethoxy-p-benzoquinone, yielded five thymol derivatives. Two of the compounds, namely: 8-hydroxy-9-isobutyryloxy-10-isovaleryloxythymol (1) and 8-hydroxy-9,10-diisovaleryloxythymol (2) have not been previously reported and their structures were elucidated b ...
DOI:
10.1016/j.phytol.2019.01.010

11. Biomass production and essential oil composition of Thymus vulgaris in response to water stress and harvest time

Author:
Said-Al Ahl, Hussein A. H.; Sabra, Ali S.; Alataway, Abed; Astatkie, Tess; Mahmoud, Abeer A.; Bloem, Elke
Source:
TheJournal of essential oil research 2019 v.31 no.1 pp. 63-68
ISSN:
2163-8152
Subject:
thymol,   etc   ; Thymus vulgaris; biomass production; essential oils; gamma-terpinene; greenhouse experimentation; harvest date; irrigation scheduling; p-cymene; water stress;     Show all 10 Subjects
Abstract:
... A greenhouse experiment was conducted to study the effects of irrigation interval (4, 8, 12 and 16 days) and harvest (2, 4, 6, 8, 10 and 12 months after transplanting) on biomass, essential oil (EO) content and composition of Thymus vulgaris. As irrigation interval increased, herb fresh and EO yield decreased, but EO content increased, suggesting water stress stimulates EO content. While fresh wei ...
DOI:
10.1080/10412905.2018.1518794

12. Synthesis, characterization and antibacterial activity of thymol-loaded polylactic acid microparticles entrapped with essential oils of varying viscosity

Author:
Biswal, Agni Kumar; Vashisht, Isha; Khan, Aamir; Sharma, Shivangi; Saha, Sampa
Source:
Journal of materials science 2019 v.54 no.13 pp. 9745-9758
ISSN:
0022-2461
Subject:
thymol,   etc   ; active food packaging; antibacterial properties; emulsions; encapsulation; essential oils; food-packaging materials; hydrophilicity; ingredients; mathematical models; microparticles; olives; polylactic acid; porosity; shelf life; surface area; synergism; viscosity;     Show all 18 Subjects
Abstract:
... Double emulsion technique (W₁/O/W₂) was used to achieve PLA (polylactic acid)-based microparticles loaded with thymol (hydrophilic antibacterial active) with high encapsulation efficiency (> 90%) that was later released in water in controlled fashion. In order to enhance the release of thymol from semicrystalline slow degrading PLA matrix, pores were introduced into the particles by incorporating ...
DOI:
10.1007/s10853-019-03593-7

13. Development of flexible antimicrobial zein coatings with essential oils for the inhibition of critical pathogens on the surface of whole fruits: Test of coatings on inoculated melons

Author:
Boyacı, Derya; Iorio, Gianmarco; Sozbilen, Gozde Seval; Alkan, Derya; Trabattoni, Silvia; Pucillo, Flavia; Farris, Stefano; Yemenicioğlu, Ahmet
Source:
Food packaging and shelf life 2019 v.20 pp. 100316
ISSN:
2214-2894
Subject:
thymol,   etc   ; Escherichia coli; agar; brittleness; carvacrol; coatings; cracking; essential oils; eugenol; food packaging; fruit peels; fruits; hydrophilicity; melons; oxygen; pathogens; shelf life; virulent strains; zein;     Show all 19 Subjects
Abstract:
... This study aimed to develop essential oil (EO)-containing antimicrobial coatings for the inhibition of pathogenic bacteria contamination on fruit peels. Incorporation of eugenol (EUG), carvacrol (CAR), and thymol (THY) into films at ≥ 1% (w/w) eliminated the typical brittleness of zein films. However, EUG outperformed CAR and THY in terms of mechanical properties. Films with ≥ 2% (w/w) CAR and THY ...
DOI:
10.1016/j.fpsl.2019.100316

14. Development of an electrochemical method to determine phenolic monoterpenes in essential oils

Author:
Robledo, Sebastian Noel; Pierini, Gastón Darío; Nieto, César Horacio Díaz; Fernández, Héctor; Zon, María Alicia
Source:
Talanta 2019 v.196 pp. 362-369
ISSN:
0039-9140
Subject:
thymol,   etc   ; calibration; carvacrol; electrochemistry; electron transfer; essential oils; gas chromatography; glassy carbon electrode; monoterpenoids; oregano; oxidation; quality control; silver; silver chloride; thyme;     Show all 15 Subjects
Abstract:
... A simple, rapid and non-expensive method is proposed to determine phenolic monoterpenes such as thymol and carvacrol in essential oils of thyme and oregano. The linear sweep voltammetry based on glassy carbon electrodes was the electrochemical technique used. Thymol and carvacrol have one main oxidation peak in non-aqueous media centered at about 1.3 V vs. Ag/AgCl. The electron transfer process is ...
DOI:
10.1016/j.talanta.2018.12.069

15. Introduction of Thymus daenensis into cultivation: Analysis of agro-morphological, phytochemical and genetic diversity of cultivated clones

Author:
Heydari, Amin; Hadian, Javad; Esmaeili, Hassan; Kanani, Mohammad Reza; Mirjalili, Mohammad Hossein; Sarkhosh, Ali
Source:
Industrial crops and products 2019 v.131 pp. 14-24
ISSN:
0926-6690
Subject:
thymol,   etc   ; Thymus daenensis; breeding; clones; cluster analysis; drugs; essential oils; genetic variation; lipid content; livestock; microsatellite repeats; poultry industry; regression analysis; Iran;     Show all 14 Subjects
Abstract:
... Thymus daenensis Celak is an endemic and thymol rich species growing in Iran. Due to the extensive use of thymol in the pharmaceutical, food, feed, as well as in the livestock and poultry industry, T. daenensis has recently been introduced into cultivation. In this study, morphological, phytochemical and ISSR markers were applied to evaluate the genetic diversity and relationships among 59 cultiva ...
DOI:
10.1016/j.indcrop.2019.01.033

16. Determination of some red dyes in food samples using a hydrophobic deep eutectic solvent-based vortex assisted dispersive liquid-liquid microextraction coupled with high performance liquid chromatography

Author:
Faraji, Mohammad
Source:
Journal of chromatography 2019 v.1591 pp. 15-23
ISSN:
0021-9673
Subject:
thymol,   etc   ; azo dyes; beverages; chocolate; detection limit; erythrosine; high performance liquid chromatography; hydrogen bonding; hydrophobicity; liquid-phase microextraction; mixing; quaternary ammonium compounds; rapid methods; solvents; standard deviation;     Show all 15 Subjects
Abstract:
... A simple, sensitive, efficient and rapid method was developed based on vortex assisted deep eutectic solvent dispersive liquid-liquid microextraction (VA-DES-DLLME) of five commonly used synthetic red dyes (amaranth, ponceau 4R, allura red, azorubine, and erythrosine) in food samples and simultaneous determination by high performance liquid chromatography. The novel hydrophobic deep eutectic solve ...
DOI:
10.1016/j.chroma.2019.01.022

17. Slow delivery of biocide from nanostructured, microscaled, particles reduces its phytoxicity: A model investigation

Author:
Mattos, Bruno Dufau; da Silva, Lucas Rafael; de Souza, Irisdoris Rodrigues; Magalhães, Washington Luiz Esteves; Leme, Daniela Morais
Source:
Journal of hazardous materials 2019 v.367 pp. 513-519
ISSN:
0304-3894
Subject:
thymol,   etc   ; Allium cepa; bioassays; biocides; biodiversity; drug delivery systems; ecosystems; food chain; genetic models; human health; medicine; pest management; phytotoxicity; plant protection; silica; toxicology;     Show all 16 Subjects
Abstract:
... Nano-engineered delivery systems have emerged as possible solutions for more efficient pest management in agriculture. Likewise for nanostructured drug delivery systems (DDS) in medicine, the use of biocide delivery systems (BDS) brought concerns on their toxicology on non-targeted organisms. Plants, for instance, are the foundation of the ecosystem, acting as primary actor in the food chain and i ...
DOI:
10.1016/j.jhazmat.2018.12.117

18. Explant type and natural ventilation systems influence growth and content of carvacrol and thymol of Lippia gracilis Schauer

Author:
Lazzarini, Luiz Eduardo Santos; Bertolucci, Suzan Kelly Vilela; de Carvalho, Alexandre Alves; Santiago, Alexsandro Carvalho; Pacheco, Fernanda Ventorim; Yucesan, Buhara; Pinto, José Eduardo Brasil Pereira
Source:
Plant cell, tissue, and organ culture 2019 v.137 no.1 pp. 33-43
ISSN:
0167-6857
Subject:
thymol,   etc   ; Lippia; carvacrol; chemical analysis; culture flasks; culture media; explants; gamma-terpinene; leaf area; leaves; natural ventilation; photosynthesis; pigments; plantlets; volatile compounds;     Show all 15 Subjects
Abstract:
... The objective of this study was to evaluate the effects of different natural ventilation systems and explant types on the growth and volatile compound content of Lippia gracilis cultured in vitro. The treatments consisted of four membrane systems (without membrane, with one, two, and four porous membranes) and two explant types (nodal segments with and without a pair of leaves). The evaluation of ...
DOI:
10.1007/s11240-018-01548-5

19. Nanoencapsulation of caffeic acid phenethyl ester in sucrose fatty acid esters to improve activities against cancer cells

Author:
Guan, Yongguang; Chen, Huaiqiong; Zhong, Qixin
Source:
Journal of food engineering 2019 v.246 pp. 125-133
ISSN:
0260-8774
Subject:
thymol,   etc   ; antineoplastic activity; breast neoplasms; caffeic acid; colorectal neoplasms; cytotoxicity; dispersions; encapsulation; fatty acid esters; heat; nanocapsules; nanoparticles; neoplasm cells; propylene glycol; sucrose; water solubility;     Show all 16 Subjects
Abstract:
... Caffeic acid phenethyl ester (CAPE) is a natural compound with anticancer activities but has low water solubility. In this work, sucrose fatty acid ester (SFAE) was used to nanoencapsulate CAPE in aqueous propylene glycol (PG) with a temperature-cycle method by heating at 90 °C for 20 min and cooling to 21 °C, followed by additional heating at 90 °C for 5 min and cooling to 21 °C. A higher amount ...
DOI:
10.1016/j.jfoodeng.2018.11.008

20. Porous metal-organic framework (MOF) Carrier for incorporation of volatile antimicrobial essential oil

Author:
Wu, Yunpeng; Luo, Yaguang; Zhou, Bin; Mei, Lei; Wang, Qin; Zhang, Boce
Source:
Food control 2019 v.98 pp. 174-178
ISSN:
0956-7135
Subject:
thymol,   etc   ; Escherichia coli O157; X-ray diffraction; antibacterial properties; biopreservatives; coordination polymers; crystal structure; developmental stages; essential oils; foods; growth retardation; nitrates; scanning electron microscopy; thermogravimetry; zinc;     Show all 15 Subjects
Abstract:
... The increasing demand for safety and quality in food products has stimulated research on developing natural preservatives and their carrier systems as a novel preventive control strategy. In this study, metal-organic framework (MOF) was investigated, for the first time, as a carrier for volatile antimicrobial essential oils. Zinc metal-organic framework (Zn@MOF) was synthesized with zinc nitrate h ...
DOI:
10.1016/j.foodcont.2018.11.011